Chess Opening Theory/1. e4/1...c6

Caro-Kann defence 1. e4 c6 King's Pawn Opening B10-B19 2. d4 · mainline 2. Nc3 · (leading to) Two knights attack 2. Nf3 · (leading to) Two knights attack 2. c4 · Accelerated Panov attack 1...c6 · Caro-Kann defence 1...c6 is the Caro-Kann. Black prepares to play 2...d5, with the c pawn ready to take back should White take it. In the traditional Open Game (1. e4 e5), many of the major threats that Black faces target their weak f7-square with White's bishop positioned on c4. Black often can consider this threat resolved if they succeed in pushing their queen's pawn to d5, controlling c4. So, by achieving d5, Black makes their kingside safer. Compared to the French defence, which prepares 2...d5 with 1...e6 instead, this avoids blocking in Black's own bishop, but at the cost of preventing Black from playing Nc6. Additionally, if Black later wishes to assault White's centre with c5, they will have lost a tempo on this move. 2. d4 is the main line. By not making a threat or controlling d4, Black allowed White to put two pawns in the centre. Black responds with 2...d5 and then the game can go in several directions depending on how White proceeds. Options include trading pawns, advancing the e-pawn to e5, or defending the e4 pawn with a piece or pawn. A sideline is the Two Knights attack, where White plays 2. Nc3, defending e4, followed by 3. Nf3, or 2. Nf3 followed by 3. Nc3. It is played about once for every ten games in the mainline. Usually, White will wait a little bit before placing the d pawn on d4 and sometimes just places it on the d3 square. 2. c4, the Accelerated Panov attack, is an aggressive sideline. Recognising that Black is determined to play d5, White wishes to make it impossible for them to hold onto it. This usually results in White and Black exchanging two pawns: 2...d5 3. cxd5 cxd5 4. exd5 Nf6 5. Nc3 Nxd5. In this line, White hopes to weaken Black's c- and d-files. White ends up with an isolated queen's pawn which may be a liability in the long run. Other moves Some other rare moves: 2. d3 is the Breyer variation. This move is fine but unambitious. After 2...d5, White's plan is to allow Black to take on e4. White plays 3. Nd2 to prevent trading the queens after 3...dxe4 4. dxe4. 2. b3 is the Euwe attack, preparing to fianchetto. White intends to give up their centre to Black and plays in a hypermodern style instead. Why-for start with 1. e4 then, and not 1. b3? Unclear, but with this idea Max Euwe triumphed over Richard Reti in 1920.Euwe v Reti (1920) - Chessgames.com 2. Bc4?! is called the Hillbilly attack. White, seeing Black is indubitably planning 2...d5, kindly makes 2...d5 even more appealing by letting Black kick their bishop while they're at it. This is certainly bad but (at the amateur level at least) not as rare as you might assume. History The earliest recorded games beginning 1. e4 c6 are from 1845 and 1847. The first game that continued 2. d4 d5 was published in 1859.The Caro-Kann Defence https://www.chesshistory.com/winter/extra/carokann.html Winter Edward 2025-04-02 2025-06-22 Chess Notes By the 1880s it was attributed to Horatio Caro, who played it and introduced it into master games, and Marcus Kann, who analysed it. A 1888 issue of Chess Monthly annotated it as, "introduced by the late Herr Kann, of Pest, and adopted in practice by Herr Caro, of Berlin. It gives a safe but dull game." Its reputation is largely the same today: a solid, defensive reply to e4, albeit one not as dynamic or combative as other approaches. It's popular with players trying to avoid learning reams of Sicilian theory. Today it is Black's fourth- or fifth-most common defence against 1. e4, much less common than 1...c5, 1...e5, or 1...e6, so makes a good surprise weapon. Theory table 1. e4 c6   2 3 4 Evaluation Main line d4 d5 = Two Knights Attack Nf3 d5 Nc3 = Two Knights Attack Nc3 d5 Nf3 = Accelerated Panov Attack c4 d5 = Breyer Variation d3 d5 Nd2 = Hillbilly Attack Bc4 d5 Euwe Attack b3 d5 exd5 cxd5 Bb2   = Labahn Attack b4   Spike variation g4   Statistics Approximate chances White win 33%, Draw 43%, Black win 24%. Estimated next move popularity d4 72%, Nf3 8%, Nc3 8%, c4 5%, d3 3%, f4 1%, Bc4 1%, other moves less than 0.5%. move average 365Chess.com (big) Chess Tempo (all) chessgames.com Lichess (masters) Lichess (database) 2. d4 72.0% 79.5 76.0 76.8 81.0 46.8 2. Nf3 8.4 3.9 4.9 3.5 3.6 26.0 2. Nc3 8.2 7.7 8.2 8.4 7.4 9.2 2. c4 5.2 4.3 6.8 7.6 4.5 2.6 2. d3 3.0 3.3 2.9 2.8 2.8 3.1 2. f4 1.0 0.4 0.3 0.2 0.1 4.2 2. Bc4 1.0 0.2 0.2 0.0 0.0 4.7 2. Ne2 0.4 0.4 0.5 0.5 0.5 2.5 2. e5 0.2 0.7 0.7 0.5 0.5 0.3 2. c3 0.1 0.1 0.0 0.0 0.0 0.6 2. b3 0.1 0.1 0.1 0.0 0.1 0.3 everything else 0.4 0.1 0.2 0.1 0.1 1.4 References See also Caro-Kann Defence External links 365Chess: 1. e4 c6